Which raises an interesting question - what's the valuable parts of Twitter? Customer base, for sure. Architecture for scalable messaging, absolutely. The rest of it? Not sure.
I'd argue that Twitter's brand is among its most valuable assets. It's globally known. Used and promoted by influencers like celebrities, artists, politicians, media, business leaders, activists. It's all over music, TV, media of all types. Heck, an entire movie was made about it.
That sort of broad public awareness is very hard for any company to get.